Hi Thanos,
Tank should have ammonia spikes follow by nitrite. Nitrate should increase gradually after cycling.
If the tank doesn't have this reading, it seems to me that it had not done cycling. Since you had added some live rocks, Cycling period might had been shorten.
What type water are you using? Natural Sea Water or Salt mix? Natural sea water will also help to shorten cycling period. From my experience, one week should be sufficient to complete cycling with NSW. Salt mix will take much longer.